REV. B

–16–

AD7008

A 3.5" floppy disk containing software to control the AD7008 is

provided with the AD7008/PCB. This software was developed

using C. The C source code is provided in a file named

A:\AD7008.C, which the user may view, run, or modify.

An executable version of this software is also provided, and can

be executed from DOS by typing “A:\AD7008.” The software

prompts the user to provide the necessary information needed

by the program. Additional information is included in a test file

named A:\readme.txt.

A windows 3.1 executable called WIN7008 is also included.

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

44-Pin PLCC (P-44A)

6

PIN 1

IDENTIFIER

7

40

39

17

18

29

28

TOP VIEW

(PINS DOWN)

0.695 (17.65)

0.685 (17.40)

SQ

0.656 (16.66)

0.650 (16.51)

SQ

0.048 (1.21)

0.042 (1.07)

0.048 (1.21)

0.042 (1.07)

0.020

(0.50)

R

0.021 (0.53)

0.013 (0.33)

0.050

(1.27)

BSC

0.63 (16.00)

0.59 (14.99)

0.032 (0.81)

0.026 (0.66)

0.180 (4.57)

0.165 (4.19)

0.040 (1.01)

0.025 (0.64)

0.056 (1.42)

0.042 (1.07)

0.025 (0.63)

0.015 (0.38)

0.110 (2.79)

0.085 (2.16)

INPUTS/OUTPUTS

Name

Description

P1

36-pin edge connector to connect to parallel

port of PC.

CLOCK

CMOS input for clock R6 provides termination.

FSEL

CMOS input to select between Freq 0 and Freq 1.

Low selects Freq 0.

SDATA

CMOS input for serial input pin.

SCLK

CMOS input for clocking in SDATA.

Analog output.

Complementary analog output.

P2

+5 V and ground power connection.

LK1

External sleep command input.

Figure 36.

Controlling the AD7008/PCB

The AD7008/PCB is designed to allow control (frequency

specification, reset, etc.) through the parallel printer port of a

standard IBM-compatible PC. The user simply disconnects the

printer cable from the printer and inserts it into edge connector

P1 of the evaluation board.

The printer port provides information to the AD7008/PCB

through eight data lines and four control lines. Control signals

are latched on the AD7008/PCB to prevent problems with long

printer cables.

V

CC

OUT

+5V

14

7

XTAL1

8

C9

0.1µF

V

EE

PR

Q

Q

CL

C

D

>

PR

Q

Q

CL

C

D

>

LATCH

LOAD

2

3

4

5

6

8

9

10

11

12

13

1

LLOAD

WR

+5V

+5V

+5V

+5V

U2

74HC74

U2

74HC74

LWR

C36DRPF

P1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

LATCH

D0

D1

D2

D3

D4

D5

D7

D6

RESET

LOAD

WR

2

3

4

5

6

7

8

9

10

D0

D1

D2

D3

D4

D5

D7

D6

10k

10PB+5

RZ1

2

3

4

5

6

LATCH

RESET

LOAD

WR

4.7k

6PB+5

RZ2

U1

DUT7008P

6

5

2

1

4

3

17

28

39

44

7

18

29

43

40

V

REF

COMP

FSADJUST

19

20

21

22

23

24

25

26

8

9

10

11

12

13

14

15

16

27

32

33

34

35

36

41

42

31

30

38

37

D0

D1

D2

D3

D4

D5

D7

D6

RESET

1

2

3

H3M

LK1

+5V

GND

+5V

+5VD

1

2

P2

PCTB2

D8

D9

D10

D11

D12

D13

D15

D14

R1

10k

SMB

SCLK

R2

10k

R3

10k

SMB

FSELECT

R6

50

OPTIONAL

WR

CS

TC0

TC2

TC1

TC3

LOAD

SCLK

SDATA

FSELECT

CLK

SLEEP

D0

D1

D2

D3

LLOAD

RESET

DGND

DGND

DGND

DGND

AGND

TEST

+5V

+5V

+5V

+5V

C7

0.1µF

+5V

R4

50

SMB

I

OUT

FSADJ

390

L

WR

SMB

SDATA

SMB

CLK

I

OUT

V

REF

SMB

I

OUT

R5

50

C6

0.1µF

C2

0.1µF

C3

0.1µF

C4

0.1µF

C5

0.1µF

C1

10µF

C8

0.1µF

D0

D1

D2

D3

D4

D5

D7

D6

V

AA

V

DD

V

DD

V

DD